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“Discrete Spacetime” features books that investigate, explain, or imaginatively explore the idea that the fabric of the universe is fundamentally granular—built from tiny, indivisible units—rather than perfectly smooth. This category spans accessible popular science and rigorous academic texts in quantum gravity and mathematical physics (e.g., loop quantum gravity, causal set theory, lattice models, discrete geometry), as well as philosophy-of-physics and information-theoretic perspectives that treat reality as computational or emergent. Topics commonly include Planck-scale structure, black holes, the early universe, simulation methods on lattices, and proposals for experimental tests of spacetime granularity. The category can also include essays and speculative fiction that use a “pixelated universe” as a central narrative or conceptual device.

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